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He was the author of an extant treatise De Figuris Sententiarum et Elocutionis, written as an installment of a complete rhetorical handbook for the use of a young and eager correspondent. While recommending Demosthenes and Cicero as models, he takes his own examples almost exclusively from Cicero. His treatise is really adapted from that by Alexander, son of Numenius, as is expressly stated by Julius Rufinianus, who brought out a supplementary treatise, augmented by material from other sources. According to the Encyclopædia Britannica Eleventh Edition, Aquila's style is harsh and careless, and the Latin is inferior.